Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 394, Issue 1, Pages 313-319Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-009-2622-2
Keywords
CE; Response surface methodology; Optimization; Glucagon; Competitive immunoassay
Funding
- National Institutes of Health [R01 DK080714]
- American Heart Association Greater Southeast Affiliate
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The capillary electrophoresis (CE) conditions for a competitive immunoassay of glucagon were optimized for highest sensitivity of the immunoassay and resolution of the electrophoretic peaks using a Box-Behnken design. Injection time, voltage ramp time, and separation voltage were varied between three levels and two responses, bound-to-free (B/F) ratio of the immunoassay peaks and resolution between the peaks, were measured. Analysis of variance was applied to fit a predictive model, and a desirability function was used to simultaneously optimize both responses. A 10-s injection, 1.6-min ramp time, and a 22-kV separation voltage were the conditions found when high B/F was given more emphasis than high resolution. To test the model, calibration curves of a glucagon immunoassay were measured at the optimum and least optimum CE conditions. Optimal conditions increased the sensitivity of the immunoassay by 388% compared to the least optimum conditions while maintaining adequate resolution.
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